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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e998532329db68e5e522969c999a5d5dac0967ef4ad268aeddb6943110e0b0de' 
  AND token = 'V0Hn+D58Cvw/sRy7Lijw95KpqqZueQbx3zeZmzqHYQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}